Method and apparatus for feeding back channel state information

Abstract

Disclosed in the present disclosure are a method and apparatus for feeding back channel state information. In the present disclosure, a terminal sends capability information of the terminal to a network device; the terminal measures a downlink reference signal sent by the network device so as to obtain measurement information, and calculates the measurement information on the basis of the Physical Downlink Shared Channel (PDSCH) transmission mode corresponding to the capability information so as to obtain Channel State Information (CSI) for feedback; and the terminal sends the CSI to the network device.

What is claimed is: 
     
         1 . A method for feeding back Channel State Information (CSI), comprising:
 sending, by a terminal, capability information of the terminal to a network device;   measuring, by the terminal, a downlink reference signal sent by the network device to obtain measurement information;   calculating, by the terminal, the measurement information based on a Physical Downlink Shared Channel (PDSCH) transmission mode corresponding to the capability information to obtain CSI for feedback; and   sending, by the terminal, the CSI to the network device;   wherein the calculating, by the terminal, the measurement information based on the PDSCH transmission mode corresponding to the capability information to obtain the CSI for feedback, comprises:   calculating the measurement information based on a first PDSCH transmission mode to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain; or   calculating the measurement information based on a first PDSCH transmission mode and/or a second PDSCH transmission mode to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal supports the at least two PDSCHs with completely overlapped time-frequency resources; or   calculating the measurement information based on a first PDSCH transmission mode to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal does not support the at least two PDSCHs with completely overlapped time-frequency resources; or   calculating the measurement information based on a first PDSCH transmission mode to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, the terminal does not support the at least two PDSCHs with partially overlapped time-frequency resources, and the terminal does not support the at least two PDSCHs with completely overlapped time-frequency resources;   wherein the first PDSCH transmission mode is: a transmission mode in which at least two PDSCHs overlap in the time domain and do not overlap in the frequency domain; the second PDSCH transmission mode is: a transmission mode in which at least two PDSCHs completely overlap in the time domain and frequency domain; in a case that calculating the measurement information based on the first PDSCH transmission mode and the second PDSCH transmission mode to obtain the CSI for feedback, the measurement information is calculated respectively based on the first PDSCH transmission mode and the second PDSCH transmission mode to obtain the CSI for feedback.   
     
     
         2 . The method according to  claim 1 , wherein the calculating, by the terminal, the measurement information based on the PDSCH transmission mode corresponding to the capability information to obtain the CSI for feedback, comprises:
 calculating the measurement information based on the PDSCH transmission mode corresponding to the capability information according to a default configuration or indication information sent by the network device to obtain the CSI for feedback;   wherein the default configuration and the indication information are configured to indicate the PDSCH transmission mode based on which the terminal calculates the CSI, and the PDSCH transmission mode indicated by the indication information matches with the capability information of the terminal.   
     
     
         3 . The method according to  claim 1 , wherein the calculating, by the terminal, the measurement information based on the PDSCH transmission mode corresponding to the capability information to obtain the CSI for feedback, comprises:
 receiving PDSCH resource allocation information sent by the network device, wherein the PDSCH resource allocation information is configured to indicate time-frequency resources of at least two PDSCHs, and the PDSCH resource allocation information matches with the capability information sent by the terminal;   calculating the measurement information based on a PDSCH transmission mode corresponding to the PDSCH resource allocation information to obtain the CSI for feedback.   
     
     
         4 . The method according to  claim 3 , wherein the calculating the measurement information based on the PDSCH transmission mode corresponding to the PDSCH resource allocation information to obtain the CSI for feedback, comprises:
 calculating the measurement information based on a PDSCH transmission mode corresponding to a first PDSCH time-frequency resource indicated by the PDSCH resource allocation information to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain; or   calculating the measurement information based on a PDSCH transmission mode corresponding to a first PDSCH time-frequency resource or a second PDSCH time-frequency resource indicated by the PDSCH resource allocation information to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal supports the at least two PDSCHs with completely overlapped time-frequency resources; or   calculating the measurement information based on a PDSCH transmission mode corresponding to a first PDSCH time-frequency resource indicated by the PDSCH resource allocation information to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal does not support the at least two PDSCHs with completely overlapped time-frequency resources; or   calculating the measurement information based on a PDSCH transmission mode corresponding to a first PDSCH time-frequency resource, a second PDSCH time-frequency resource allocation or a third time-frequency resource allocation indicated by the PDSCH resource allocation information to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, the terminal supports the at least two PDSCHs with partially overlapped time-frequency resources, and the terminal supports the at least two PDSCHs with completely overlapped time-frequency resources; or   calculating the measurement information based on a PDSCH transmission mode corresponding to a first PDSCH time-frequency resource or a second time-frequency resource allocation indicated by the PDSCH resource allocation information to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, the terminal does not support the at least two PDSCHs with partially overlapped time-frequency resources, and the terminal supports the at least two PDSCHs with completely overlapped time-frequency resources; or   calculating the measurement information based on a PDSCH transmission mode corresponding to a first PDSCH time-frequency resource or a third time-frequency resource allocation indicated by the PDSCH resource allocation information to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, the terminal supports the at least two PDSCHs with partially overlapped time-frequency resources, and the terminal does not support the at least two PDSCHs with completely overlapped time-frequency resources; or   calculating the measurement information based on a PDSCH transmission mode corresponding to a first PDSCH time-frequency resource indicated by the PDSCH resource allocation information to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, the terminal does not support the at least two PDSCHs with partially overlapped time-frequency resources, and the terminal does not support the at least two PDSCHs with completely overlapped time-frequency resources; or   calculating the measurement information based on a PDSCH transmission mode corresponding to a first PDSCH time-frequency resource or a third PDSCH time-frequency resource indicated by the PDSCH resource allocation information to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal supports the at least two PDSCHs with partially overlapped time-frequency resources; or   calculating the measurement information based on a PDSCH transmission mode corresponding to a first PDSCH time-frequency resource indicated by the PDSCH resource allocation information to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal does not support the at least two PDSCHs with partially overlapped time-frequency resources;   wherein the first PDSCH time-frequency resource is: at least two PDSCHs that overlap in the time domain and do not overlap in the frequency domain, and the PDSCH transmission mode corresponding to the first PDSCH time-frequency resource is: a transmission mode in which at least two PDSCHs overlap in the time domain and do not overlap in the frequency domain;   the second PDSCH time-frequency resource is: at least two PDSCHs with completely overlapped time-frequency resources, and the PDSCH transmission mode corresponding to the second PDSCH time-frequency resource is: a transmission mode in which at least two PDSCHs completely overlap in the time domain and frequency domain;   the third PDSCH time-frequency resource is: at least two PDSCHs that partially overlap in the time domain, and the PDSCH transmission mode corresponding to the third PDSCH time-frequency resource is: a transmission mode in which at least two PDSCHs overlap in the time domain and do not overlap in the frequency domain.   
     
     
         5 . The method according to  claim 1 , wherein the calculating the measurement information to obtain the CSI for feedback, comprises:
 calculating the CSI for feedback based on beams corresponding to at least two used downlink reference signal resources to receive at least two PDSCHs, in a case that the terminal uses at least two beams to receive the downlink reference signal;   selecting one of at least two downlink reference signal resources and calculating the CSI for feedback based on using a beam corresponding to the selected downlink reference signal resource to receive the at least two PDSCHs or based on using other beams to receive the at least two PDSCHs, in a case that the terminal uses one beam to receive the downlink reference signal.   
     
     
         6 . A computer readable storage medium, wherein the computer readable storage medium stores computer executable instructions configured to cause a computer to perform the method of  claim 1 . 
     
     
         7 . A method for feeding back Channel State Information, (CSI), comprising:
 receiving, by a network device, capability information of a terminal sent by the terminal; and   receiving, by the network device, CSI sent by the terminal;   wherein the CSI is obtained by the terminal by calculating measurement information of a downlink reference signal based on a Physical Downlink Shared Channel (PDSCH) transmission mode corresponding to the capability information;   wherein the method further comprises:   instructing, by the network device, the terminal to determine the CSI for feedback based on the PDSCH transmission mode corresponding to the capability information according to the capability information of the terminal;   wherein the instructing, by the network device, the terminal to determine the CSI for feedback based on the PDSCH transmission mode corresponding to the capability information according to the capability information of the terminal, comprises:   sending, by the network device, indication information to the terminal;   wherein the indication information is configured to indicate the PDSCH transmission mode based on which the terminal calculates the CSI, and the PDSCH transmission mode indicated by the indication information matches with the capability information of the terminal;   wherein the sending, by the network device, indication information to the terminal, wherein the indication information is configured to indicate the PDSCH transmission mode based on which the terminal calculates the CSI, comprises:   sending indication information for indicating a first PDSCH transmission mode and/or a second PDSCH transmission mode, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal supports the at least two PDSCHs with completely overlapped time-frequency resources; or   sending indication information for indicating a first PDSCH transmission mode, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal does not support the at least two PDSCHs with completely overlapped time-frequency resources; or   sending indication information for indicating the first PDSCH transmission mode, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, the terminal does not support the at least two PDSCHs with partially overlapped time-frequency resources, and the terminal does not support the at least two PDSCHs with completely overlapped time-frequency resources;   wherein the first PDSCH transmission mode is: a transmission mode in which at least two PDSCHs overlap in the time domain and do not overlap in the frequency domain; and   the second PDSCH transmission mode is: a transmission mode in which at least two PDSCHs completely overlap in the time domain and the frequency domain.   
     
     
         8 . The method according to  claim 7 , wherein the sending, by the network device, indication information to the terminal, comprises:
 sending, by the network device, dedicated signaling to the terminal, wherein the dedicated signaling carries the indication information; or   sending, by the network device, dynamic signaling to the terminal, wherein the dynamic signaling carries the indication information; or   sending, by the network device, dedicated signaling carrying first indication information to the terminal, and sending dynamic signaling carrying second indication information to the terminal in a case that the PDSCH transmission mode changes; wherein the first indication information is configured to indicate a PDSCH transmission mode set, and the second indication information is configured to indicate one PDSCH transmission mode in the PDSCH transmission mode set, and the PDSCH transmission mode set at least comprises a first PDSCH transmission mode and a second PDSCH transmission mode;   wherein the first PDSCH transmission mode is: a transmission mode in which at least two PDSCHs overlap in the time domain and do not overlap in the frequency domain; and the second PDSCH transmission mode is: a transmission mode in which at least two PDSCHs completely overlap in the time domain and frequency domain.   
     
     
         9 . The method according to  claim 7 , wherein the instructing, by the network device, the terminal to determine the CSI for feedback based on the PDSCH transmission mode corresponding to the capability information according to the capability information of the terminal, comprises:
 sending, by the network device, PDSCH resource allocation information to the terminal;   wherein the PDSCH resource allocation information is configured to indicate time-frequency resources of at least two PDSCHs, and the PDSCH resource allocation information matches with the capability information sent by the terminal.   
     
     
         10 . The method according to  claim 9 , wherein the sending, by the network device, PDSCH resource allocation information to the terminal, wherein the PDSCH resource allocation information is configured to indicate time-frequency resources of at least two PDSCHs, comprises:
 sending the PDSCH resource allocation information for indicating a first PDSCH time-frequency resource to the terminal, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain; or   sending the PDSCH resource allocation information for indicating a first PDSCH time-frequency resource or a second PDSCH time-frequency resource to the terminal, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal supports the at least two PDSCHs with completely overlapped time-frequency resources; or   sending the PDSCH resource allocation information for indicating a first PDSCH time-frequency resource to the terminal, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal does not support the at least two PDSCHs with completely overlapped time-frequency resources; or   sending the PDSCH resource allocation information for indicating a first PDSCH time-frequency resource, a second PDSCH time-frequency resource allocation or a third time-frequency resource allocation to the terminal, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, the terminal supports the at least two PDSCHs with partially overlapped time-frequency resources, and the terminal supports the at least two PDSCHs with completely overlapped time-frequency resources; or   sending the PDSCH resource allocation information for indicating a first PDSCH time-frequency resource or a second time-frequency resource allocation to the terminal, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, the terminal does not support the at least two PDSCHs with partially overlapped time-frequency resources, and the terminal supports the at least two PDSCHs with completely overlapped time-frequency resources; or   sending the PDSCH resource allocation information for indicating a first PDSCH time-frequency resource or a third time-frequency resource allocation to the terminal, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, the terminal supports the at least two PDSCHs with partially overlapped time-frequency resources, and the terminal does not support the at least two PDSCHs with completely overlapped time-frequency resources; or   sending the PDSCH resource allocation information for indicating a first PDSCH time-frequency resource to the terminal, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, the terminal does not support the at least two PDSCHs with partially overlapped time-frequency resources, and the terminal does not support the at least two PDSCHs with completely overlapped time-frequency resources; or   sending the PDSCH resource allocation information for indicating a first PDSCH time-frequency resource or a third PDSCH time-frequency resource to the terminal, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal supports the at least two PDSCHs with partially overlapped time-frequency resources; or   sending the PDSCH resource allocation information for indicating a first PDSCH time-frequency resource to the terminal, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal does not support the at least two PDSCHs with partially overlapped time-frequency resources;   wherein the first PDSCH time-frequency resource is: at least two PDSCHs that overlap in the time domain and do not overlap in the frequency domain, and the PDSCH transmission mode corresponding to the first PDSCH time-frequency resource is: a transmission mode in which at least two PDSCHs overlap in the time domain and do not overlap in the frequency domain;   the second PDSCH time-frequency resource is: at least two PDSCHs with completely overlapped time-frequency resources, and the PDSCH transmission mode corresponding to the second PDSCH time-frequency resource is: a transmission mode in which at least two PDSCHs completely overlap in the time domain and frequency domain; and   the third PDSCH time-frequency resource is: at least two PDSCHs that partially overlap in the time domain, and the PDSCH transmission mode corresponding to the third PDSCH time-frequency resource is: a transmission mode in which at least two PDSCHs overlap in the time domain and do not overlap in the frequency domain.   
     
     
         11 . A computer readable storage medium, wherein the computer readable storage medium stores computer executable instructions configured to cause a computer to perform the method of  claim 7 . 
     
     
         12 . A terminal, comprising: a processor, a memory and a transceiver;
 the transceiver receives and sends data under control of the processor;   the memory stores computer instructions;   the processor is configured to read the computer instructions to perform:   sending, by a terminal, capability information of the terminal to a network device;   measuring, by the terminal, a downlink reference signal sent by the network device to obtain measurement information;   calculating, by the terminal, the measurement information based on a Physical Downlink Shared Channel (PDSCH) transmission mode corresponding to the capability information to obtain Channel State Information (CSI) for feedback; and   sending, by the terminal, the CSI to the network device;   wherein the processor is further configured to read the computer instructions to perform:   calculating the measurement information based on a first PDSCH transmission mode to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain; or   calculating the measurement information based on a first PDSCH transmission mode and/or a second PDSCH transmission mode to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal supports the at least two PDSCHs with completely overlapped time-frequency resources; or   calculating the measurement information based on a first PDSCH transmission mode to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal does not support the at least two PDSCHs with completely overlapped time-frequency resources; or   calculating the measurement information based on a first PDSCH transmission mode to obtain the CSI for feedback, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, the terminal does not support the at least two PDSCHs with partially overlapped time-frequency resources, and the terminal does not support the at least two PDSCHs with completely overlapped time-frequency resources;   wherein the first PDSCH transmission mode is: a transmission mode in which at least two PDSCHs overlap in the time domain and do not overlap in the frequency domain; the second PDSCH transmission mode is: a transmission mode in which at least two PDSCHs completely overlap in the time domain and frequency domain; in a case that calculating the measurement information based on the first PDSCH transmission mode and the second PDSCH transmission mode to obtain the CSI for feedback, the measurement information is calculated respectively based on the first PDSCH transmission mode and the second PDSCH transmission mode to obtain the CSI for feedback.   
     
     
         13 . The terminal according to  claim 12 , wherein the processor is further configured to read the computer instructions to perform:
 receiving PDSCH resource allocation information sent by the network device, wherein the PDSCH resource allocation information is configured to indicate time-frequency resources of at least two PDSCHs, and the PDSCH resource allocation information matches with the capability information sent by the terminal; and   calculating the measurement information based on a PDSCH transmission mode corresponding to the PDSCH resource allocation information to obtain the CSI for feedback.   
     
     
         14 . A network device, comprising a processor, a memory and a transceiver;
 the transceiver receives and sends data under control of the processor;   the memory stores computer instructions;   the processor is configured to read the computer instructions to perform:   receiving capability information of a terminal sent by the terminal; and   receiving Channel State Information (CSI) sent by the terminal;   wherein the CSI is obtained by the terminal by calculating measurement information of a downlink reference signal based on a Physical Downlink Shared Channel (PDSCH) transmission mode corresponding to the capability information;   wherein the processor is further configured to read the computer instructions to perform:   instructing, by the network device, the terminal to determine the CSI for feedback based on the PDSCH transmission mode corresponding to the capability information according to the capability information of the terminal;   wherein the processor is further configured to read the computer instructions to perform:   sending, by the network device, indication information to the terminal;   wherein the indication information is configured to indicate the PDSCH transmission mode based on which the terminal calculates the CSI, and the PDSCH transmission mode indicated by the indication information matches with the capability information of the terminal;   wherein the processor is further configured to read the computer instructions to perform:   sending indication information for indicating a first PDSCH transmission mode and/or a second PDSCH transmission mode, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal supports the at least two PDSCHs with completely overlapped time-frequency resources; or   sending indication information for indicating a first PDSCH transmission mode, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, and the terminal does not support the at least two PDSCHs with completely overlapped time-frequency resources; or   sending indication information for indicating the first PDSCH transmission mode, in a case that the capability information indicates that the terminal supports at least two PDSCHs that overlap in a time domain and do not overlap in a frequency domain, the terminal does not support the at least two PDSCHs with partially overlapped time-frequency resources, and the terminal does not support the at least two PDSCHs with completely overlapped time-frequency resources;   wherein the first PDSCH transmission mode is: a transmission mode in which at least two PDSCHs overlap in the time domain and do not overlap in the frequency domain; and   the second PDSCH transmission mode is: a transmission mode in which at least two PDSCHs completely overlap in the time domain and the frequency domain.